KABUL, Afghanistan (AP) -- An Afghan presidential hopeful says all indications are that nobody has won in the first round of voting over the weekend and a runoff will need to be held.

Zalmai Rassoul, a former foreign minister who is considered one of three front-runners in a field of eight candidates, also said Tuesday that "massive fraud" took place in the balloting for a new leader. Hamid Karzai is constitutionally barred from a third term.

Saturday's election has been largely hailed as a success after a high turnout and relatively little violence despite a Taliban threat to disrupt the vote.

Many have predicted that nobody would get the majority needed to win outright and a second round would need to be held. But Rassoul is the first front-runner to say it directly.